采用温室培养试验研究锑对地枇杷生理变化的影响.结果表明,当锑浓度高于30μmol/L时,地枇杷叶片的生长明显受到抑制,而地枇杷的根和茎在所有的锑浓度下都没有明显的变化,表明地枇杷的叶片比根和茎对锑的毒性更敏感,且在根中锑浓度要高于茎和叶中的.地枇杷通过增加超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)活性来减少锑胁迫产生的活性氧(ROS)水平,但在锑胁迫早期,SOD和CAT比POD的作用更明显.在锑胁迫早期,不同浓度的锑能够在一定程度上增加地枇杷叶绿素的含量,但在锑胁迫后期(实验结束时),叶绿素含量在高浓度锑(450μmol/L)胁迫下显著降低.在整个培养阶段中,地枇杷最大光量子产量和实际光量子产量值没有显著差异,表明地枇杷在锑浓度为450μmol/L以下时,光合作用未受明显抑制.地枇杷具有一定的锑耐受能力,可用于锑污染土壤修复.
A greenhouse culture experiment was used to evaluate the effects of antimony (Sb) stress on Ficus tikoua (F. tikoua). The results showed that the growth of F. tikoua leaves was significantly inhibited when Sb concentration was higher than 30 μmol/L, and no significantly inhibitory effect of Sb on the roots and stems of F. tikoua was found in all the treatments, implying that leaves were more sensitive to Sb toxicity than roots and stems. Antimony concentration in the roots was higher than that in the stems and leaves. To reduce reactive oxygen species (ROS) level in the F. tikoua, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) increased with Sb treatments, but the SOD and CAT were more early active than POD. Although the decrease of chlorophyll content with high Sb treatments (450 μmol/L) was observed at the end of the experiments, the positive impact on chlorophyll content was observed with all the Sb treatments at the early period. No significant difference of the maximum quantum efficiency of PSII and quantum yield of PSII electron transport values with different Sb treatments was observed at the end of this experiment, suggesting that the photosynthesis was not inhibited with Sb concentration below 450 μmol/L. The results implied a certain tolerance to Sb stress for F. tikoua. This meets the essential condition for utilization in Sb contamination environments.
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